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Frogger is an arcade game introduced in 1981. It was developed by Konami, and licensed for worldwide distribution by Sega/Gremlin. The object of the game is to direct frogs to their homes one by one. To do this, each frog must avoid cars while crossing a busy road and navigate a river full of hazards. Skillful players may obtain some bonuses along the way. The game is regarded as a classic from the golden age of video arcade games and was noted for its novel gameplay and theme. It was also an early example of a game using more than one CPU, as it used two Z80 processors. Frogger is still popular and clones can be found on many Internet game sites. By 2005, Frogger had sold 20 million copies worldwide, including 5 million in the United States.
Like many arcade games of the period, Frogger was ported to all the major home computers and consoles of the time. Parker Brothers received the license from Sega for cartridge versions, while Sierra gained the magnetic media rights. Several platforms were capable of accepting both ROM cartridges and magnetic media, thus these systems received multiple versions of the game. Sierra also sublicensed their magnetic-media rights to developers who published for systems not normally supported by Sierra (e.g. Cornsoft published the official TRS-80, Timex Sinclair 1000 and Timex Sinclair 2068 ports); because of this, even the Atari 2600 received multiple releases: a cartridge from Parker Bros. and a cassette for the Supercharger from Starpath. The Tomy Tutor version was directly licensed from Konami themselves, although it is not clear if they developed it.